block/blk-mq.h

   1 #ifndef INT_BLK_MQ_H
   2 #define INT_BLK_MQ_H
   3
   4 struct blk_mq_tag_set;
   5
   6 struct blk_mq_ctx {
   7         struct {
   8                 spinlock_t              lock;
   9                 struct list_head        rq_list;
  10         }  ____cacheline_aligned_in_smp;
  11
  12         unsigned int            cpu;
  13         unsigned int            index_hw;
  14
  15         unsigned int            last_tag ____cacheline_aligned_in_smp;
  16
  17         /* incremented at dispatch time */
  18         unsigned long           rq_dispatched[2];
  19         unsigned long           rq_merged;
  20
  21         /* incremented at completion time */
  22         unsigned long           ____cacheline_aligned_in_smp rq_completed[2];
  23
  24         struct request_queue    *queue;
  25         struct kobject          kobj;
  26 } ____cacheline_aligned_in_smp;
  27
  28 void __blk_mq_complete_request(struct request *rq);
  29 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
  30 void blk_mq_init_flush(struct request_queue *q);
  31 void blk_mq_drain_queue(struct request_queue *q);
  32 void blk_mq_free_queue(struct request_queue *q);
  33 void blk_mq_clone_flush_request(struct request *flush_rq,
  34                 struct request *orig_rq);
  35 int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
  36
  37 /*
  38  * CPU hotplug helpers
  39  */
  40 struct blk_mq_cpu_notifier;
  41 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
  42                               int (*fn)(void *, unsigned long, unsigned int),
  43                               void *data);
  44 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
  45 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
  46 void blk_mq_cpu_init(void);
  47 void blk_mq_enable_hotplug(void);
  48 void blk_mq_disable_hotplug(void);
  49
  50 /*
  51  * CPU -> queue mappings
  52  */
  53 extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
  54 extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues);
  55 extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
  56
  57 /*
  58  * Basic implementation of sparser bitmap, allowing the user to spread
  59  * the bits over more cachelines.
  60  */
  61 struct blk_align_bitmap {
  62         unsigned long word;
  63         unsigned long depth;
  64 } ____cacheline_aligned_in_smp;
  65
  66 #endif